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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Mount Prospect IL
National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 9:26 pm CDT May 26, 2026
 
Tonight

Tonight: Partly cloudy, with a low around 62. Southeast wind around 5 mph becoming west northwest after midnight.
Partly Cloudy
Wednesday

Wednesday: Mostly sunny, with a high near 81. North northwest wind 5 to 10 mph becoming east northeast in the afternoon.
Mostly Sunny
Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 54. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Partly Cloudy
Thursday

Thursday: Sunny, with a high near 69. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Sunny
Thursday
Night
Thursday Night: Mostly clear, with a low around 52. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Mostly Clear
Friday

Friday: Sunny, with a high near 80.
Sunny
Friday
Night
Friday Night: Mostly clear, with a low around 59.
Mostly Clear
Saturday

Saturday: Sunny, with a high near 78.
Sunny
Saturday
Night
Saturday Night: Mostly clear, with a low around 57.
Mostly Clear
Lo 62 °F Hi 81 °F Lo 54 °F Hi 69 °F Lo 52 °F Hi 80 °F Lo 59 °F Hi 78 °F Lo 57 °F

Air Quality Alert
Beach Hazards Statement
 

Tonight
 
Partly cloudy, with a low around 62. Southeast wind around 5 mph becoming west northwest after midnight.
Wednesday
 
Mostly sunny, with a high near 81. North northwest wind 5 to 10 mph becoming east northeast in the afternoon.
Wednesday Night
 
Partly cloudy, with a low around 54. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
 
Sunny, with a high near 69. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday Night
 
Mostly clear, with a low around 52. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Friday
 
Sunny, with a high near 80.
Friday Night
 
Mostly clear, with a low around 59.
Saturday
 
Sunny, with a high near 78.
Saturday Night
 
Mostly clear, with a low around 57.
Sunday
 
Sunny, with a high near 76.
Sunday Night
 
Mostly clear, with a low around 56.
Monday
 
Sunny, with a high near 76.
Monday Night
 
Mostly clear, with a low around 57.
Tuesday
 
Sunny, with a high near 78.

 

Forecast from NOAA-NWS for Mount Prospect IL.

Weather Forecast Discussion
963
FXUS63 KLOT 262326
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
626 PM CDT Tue May 26 2026

.KEY MESSAGES...

- Generally above normal temperatures (highs in the 80s) and
  dry conditions are expected through early next week. Onshore
  winds will keep temperatures cooler near Lake Michigan each
  day (60s-70s).

- Backdoor cold fronts will lead to cooler conditions (60s and
  70s) extending farther inland late Wednesday into Thursday and
  potentially again over the weekend.

&&

.DISCUSSION...
Issued at 217 PM CDT Tue May 26 2026

A mid-level ridge axis continues to reside across the southern
Great Lakes which is maintaining generally tranquil weather
conditions. Despite the widespread cirrus coverage overhead,
temperatures continue to warm into the lower to mid-80s which is
just about at their peak for today. That said, a lake breeze is
developing near the lake and will begin to ooze inland over the
next few hours resulting in locally cooler temperatures near
the lake.

Heading into tonight, the ridge axis will begin to move east of
the area as the broad trough over Ontario digs into the
northern Great Lakes. At the same time, the low center over
southwest IL and eastern MO will continue to lift towards the
area tonight. Associated with this low are some scattered
showers and a few thunderstorms, but their coverage should
weaken as the low approaches due to the drier air across
northern and northeast IL and northwest IN. However, there is
still a 15-20% chance for an isolated shower or two to brush our
southern CWA (namely areas along and south of US-24) overnight.
Otherwise, dry conditions can be expected with light and
variable winds and mild temperatures in the lower to mid-60s.

By Wednesday the aforementioned surface low will begin to drift
east across central IL and IN as a cold front begins to race
southward out of WI and northern Lake Michigan. While a few
showers (and perhaps and isolated rumble of thunder) may linger
along/south of US-24, mostly dry conditions are expected across
the rest of the area. The cold front is expected to move
through northern IL and northwest IN late Wednesday afternoon
and evening which will result in quickly cooling temperatures in
its wake, especially near the lake. Given the late arrival of
fropa, highs on Wednesday look to still be able to reach into
the lower to possibly middle 80s inland but prevailing onshore
winds will keep lakeside temperatures notably cooler in the 60s
to around 70. However, if the front arrives faster than forecast
then highs could end up being a few degrees cooler areawide.
Regardless, the frontal passage looks to be mostly dry though
there is still a 15-20% chance for an isolated shower or
thunderstorm to develop near the IL-WI line.

In addition to the cooling temperatures, the front will also
bring breezy north-northeast winds to the area with gusts
upwards of 20-25 mph Wednesday evening through Thursday. With
the onshore wind direction the winds will also result in
building waves and an increased risk for rip currents on Lake
Michigan. Therefore, dangerous swimming conditions are forecast
Wednesday night through Thursday.

High pressure is expected to build back into the Great Lakes
Wednesday night through weeks end which will result in dry and
tranquil weather conditions. Though, persistent northeast winds
do look to keep temperatures more in the seasonable range with
daily highs in the upper 70s to lower 80s (60s near the lake),
especially on Thursday, and overnight lows in the 50s through
next weekend.

Yack

&&

.AVIATION /00Z TAFS THROUGH 06Z THURSDAY/...
Issued at 626 PM CDT Tue May 26 2026

There are no key concerns for the 00Z TAF period:

SE winds below 10 kt this evening will go light and variable
tonight. Winds will establish a NE direction by mid-morning
Wednesday moving at less than 10 kt through the afternoon, and
closer to 10 kt during the evening. Expect VFR throughout the
period.

Doom

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Air Quality Alert until 6 AM CDT Thursday for ILZ005-ILZ006-
     ILZ012-ILZ013-ILZ020-ILZ021-ILZ103-ILZ104-ILZ105-ILZ106-
     ILZ107-ILZ108.

     Beach Hazards Statement from Wednesday evening through late
     Thursday night for ILZ006-ILZ103-ILZ104.

IN...Air Quality Alert from midnight tonight to midnight CDT
     Wednesday night for INZ001-INZ002-INZ010-INZ011.

     Beach Hazards Statement from late Wednesday night through late
     Thursday night for INZ001-INZ002.

LM...Small Craft Advisory from 10 PM Wednesday to 10 PM CDT
     Thursday for the IL nearshore waters.

     Small Craft Advisory from 4 AM Thursday to 1 AM CDT Friday for
     the IN nearshore waters.

&&

$$

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